#include <stdio.h>
int main()
{
	double r, S, C,PI;
	PI = 3.14159;
	printf("input r=");
	scanf_s("%lf",&r);
	S = PI * r * r;
	C = 2 * PI * r;
	printf("S=%.2lf\n", S);
	printf("C=%.2lf\n", C);
	return 0;
}
